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You have selected the "Passenger Name" field as your Sender Name so this should be unique for every submission. But I think you are seeing the emails in a thread so I would suggest putting the name field in your subject line. Example:
This way, you will receive each submission as a new thread instead of just a single thread with the same subject line (New Reservation).
Please do not hesitate to get back to us if you need further assistance about this matter.